Five novel cis-3-(2-chloro-3,3,3-trifluoropropenyl)-2,2-dimethylcyclopropyl formyl thiourea derivatives(4a～4e) have been synthesized. Their structures are characterized by 1H NMR, IR and elemental analysis. The preli...Five novel cis-3-(2-chloro-3,3,3-trifluoropropenyl)-2,2-dimethylcyclopropyl formyl thiourea derivatives(4a～4e) have been synthesized. Their structures are characterized by 1H NMR, IR and elemental analysis. The preliminary herbicidal tests indicate the compound 4a shows a better inhibitory activity to broad leaf plant, 4d and 4e to monoctyledon plant, respectively.展开更多
Eight N (substituted pyrimidin 2 yl) N β (or γ )pyridinecarbonyl thioureas are synthesied and tested for biological activity.All of them are new compounds and their structures are comfirmed by IR, 1HNMR and elemen...Eight N (substituted pyrimidin 2 yl) N β (or γ )pyridinecarbonyl thioureas are synthesied and tested for biological activity.All of them are new compounds and their structures are comfirmed by IR, 1HNMR and elementary analysis.The preliminary biological test shows that some of the target compounds have excellent inhibitory activities against root and stalk of dicotyledon plant (such as rape) and a good regulating activity for plant growth of monocotyledon(such as corn).展开更多
文摘本文拟建立二乙酰一肟-氨基硫脲测定游泳池中尿素的方法,从波长的选择、酸度的条件、试剂的加入量、温度的条件、加热时间来寻求最佳条件。结果表明:实验最理想条件是在酸性条件,线性方程结果良好,r=0.999 6,检测波长为480 nm,混合酸溶液加入量为5.00 m L,二乙酰一肟-氨基硫脲溶液加入量为2 m L,加热时间为20 min,线性范围为0~10 mg/L。该方法检测结果良好,可用于游泳池中的尿素测定。
文摘Five novel cis-3-(2-chloro-3,3,3-trifluoropropenyl)-2,2-dimethylcyclopropyl formyl thiourea derivatives(4a～4e) have been synthesized. Their structures are characterized by 1H NMR, IR and elemental analysis. The preliminary herbicidal tests indicate the compound 4a shows a better inhibitory activity to broad leaf plant, 4d and 4e to monoctyledon plant, respectively.
文摘Eight N (substituted pyrimidin 2 yl) N β (or γ )pyridinecarbonyl thioureas are synthesied and tested for biological activity.All of them are new compounds and their structures are comfirmed by IR, 1HNMR and elementary analysis.The preliminary biological test shows that some of the target compounds have excellent inhibitory activities against root and stalk of dicotyledon plant (such as rape) and a good regulating activity for plant growth of monocotyledon(such as corn).
